Mission-oriented protective posture (MOPP) is a flexible system of protection against chemical agents, used to facilitate mission accomplishment in chemical warfare. MOPP requires the individual to wear protective equipment consistent with the chemical threat, the work rate imposed by the mission, and the temperature. (See table 9-1 for MOPP levels.)

Table 9-1.-MOPP Levels before Chemical Attack

All combat operations are conducted under the mission-oriented protective posture system. Of course, when there is no threat, then there is no protection requirement, but this is still a MOPP. At the other extreme, when there is a continuing, immediate threat of chemical attack and the enemy has the capability to produce an unacceptable casualty level among unprotected troops, the troops may be required to wear protective clothing and equipment for extended periods. In this case, some form of safe area must be provided, so troops can perform the necessary functions that require removal of some or all of the protective gear.